They're made by an Italian company called Cedri Martini, and according to quintessential lifestyle navigators Charles & Marie, they're billed as "adhesive book shelves":
The concept is as simple as it is visually stunning, an always repeating pattern is attached to the wall (with screws, not adhesives…) and then you can have a blast and fill them up how ever you want to.I mean, they're visual, and I'm definitely stunned, but I dunno about "visually stunning." Maybe I'm just old-fashioned, but I like to keep my books on something that doesn't remind me of my shower surround.
But, hey, I thought some of you weirdos might like them. So voila!